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Sagot :
Step-by-step explanation:
2/3 of 42 = 42×2/3 = 84/3 = 28
so, they sold 28 copies yesterday.
that left 42-28 = 14.
from these 14 they sold 2/7 today.
2/7 of 14 = 14×2/7 = 28/7 = 4
that left now 14 - 4 = 10 copies.
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